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LOANS (Details 9) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loan Servicing      
Unpaid principal balances of mortgage loans serviced $ 188,337,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized $ 186,288,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized  
Custodial escrow balances 763,000us-gaap_EscrowDeposit 578,000us-gaap_EscrowDeposit  
Servicing Rights:      
Beginning balance 1,343,887us-gaap_ServicingAssetAtAmortizedValue 1,152,436us-gaap_ServicingAssetAtAmortizedValue 834,675us-gaap_ServicingAssetAtAmortizedValue
Additions 270,088us-gaap_ServicingAssetAtAmortizedValueAdditions 445,812us-gaap_ServicingAssetAtAmortizedValueAdditions 627,999us-gaap_ServicingAssetAtAmortizedValueAdditions
Amortization (385,248)us-gaap_ServicingAssetAtAmortizedValueAmortization1 (409,361)us-gaap_ServicingAssetAtAmortizedValueAmortization1 (346,238)us-gaap_ServicingAssetAtAmortizedValueAmortization1
Change in valuation allowance (20,000)us-gaap_ServicingAssetAtAmortizedValueValuationAllowance 155,000us-gaap_ServicingAssetAtAmortizedValueValuationAllowance 36,000us-gaap_ServicingAssetAtAmortizedValueValuationAllowance
Ending balance 1,208,727us-gaap_ServicingAssetAtAmortizedValue 1,343,887us-gaap_ServicingAssetAtAmortizedValue 1,152,436us-gaap_ServicingAssetAtAmortizedValue
Valuation Allowance:      
Beginning balance 59,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance 214,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance 250,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Additions expensed 34,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions 73,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions 92,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions
Reductions credited to operations 14,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsAggregateWriteDowns 228,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsAggregateWriteDowns 128,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsAggregateWriteDowns
Ending balance 79,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance 59,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance 214,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Fair value of servicing rights 1,600,000us-gaap_ServicingAssetAtAmortizedValueFairValue 1,700,000us-gaap_ServicingAssetAtAmortizedValueFairValue  
Assumptions used in determination of fair value      
Discount rate (as a percent) 12.00%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate 12.00%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate  
Weighted average amortization period 6 years 3 months 18 days    
Estimated amortization expense for each of the next five years      
2015 316,000ktyb_ServicingAssetsAmortizationExpenseNextTwelveMonths    
2016 246,000ktyb_ServicingAssetsAmortizationExpenseYearTwo    
2017 184,000ktyb_ServicingAssetsAmortizationExpenseYearThree    
2018 134,000ktyb_ServicingAssetsAmortizationExpenseYearFour    
2019 $ 98,000ktyb_ServicingAssetsAmortizationExpenseYearFive    
Minimum      
Assumptions used in determination of fair value      
Prepayment speeds (as a percent) 7.90%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
7.00%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Default rates (as a percent) 0.10%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.10%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum      
Assumptions used in determination of fair value      
Prepayment speeds (as a percent) 35.00%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
23.50%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Default rates (as a percent) 0.90%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
0.90%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses
/ us-gaap_RangeAxis
= us-gaap_MaximumMember